/*
Time:2019.11.2
Author: Goven
type:数学:公式推导
err:
ref:不会https://blog.csdn.net/chenchaoflight/article/details/8722122
*/
#include<iostream>
#include<cmath>
using namespace std;
int main()
{
double Vs, Vr, R, C, n, w, tp;
cin >> Vs >> R >> C >> n;
while (n--) {
cin >> w;
tp = R * C * w;
printf("%.3lf\n", tp * Vs / sqrt(tp * tp + 1));
}
return 0;
}
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